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A. A clicking noise means there's not enough power to engage the starter. Usually a sign of a low battery. Diesels have 2 batteries so this shouldn't be a problem, but it might still. B. How are you checking their charge level? C. Have you checked all cabling to ensure everything is tight and well connected? D. Have you checked the fuse box for any blown fuses? E. The typical life of batteries is 5yrs, so I'd recommend replacing them anyways. F. How are you jumping the truck when you make the attempt? G. Do you notice any dash signals flashing when you turn the ignition? H. Dim headlights mean a low amount of juice getting to them (low battery). I. A thought that just came to me is the alternator could be gone. Would explain why 2 batteries died. Sorry they are not in order but that's a printout of my thought processes as I read your question.
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